This is the 680th most frequent Indonesian word.
si
A definite article used before a person’s name or nickname to indicate familiarity or specificity.
Here, 'si' is used as a casual and familiar marker for a person's name.
Si Budi adalah teman baikku.
Budi is my good friend.
In this sentence, 'si' denotes a fictional or story character name, adding familiarity.
Ceritanya tentang si Kancil yang cerdik.
The story is about the clever Mousedeer.
Here, 'si' is employed as an affectionate prefix to describe 'kecil' (the little one), personifying the subject.